Alert archive / Georgia / Mesoscale Discussions in 2008
Mesoscale Discussion 2446
The Storm Prediction Center issued this mesoscale discussion at Dec 11, 2008, 8:24 AM EST for 26 counties in Florida; 35 counties in Georgia; Jasper County, South Carolina. It was in force for 66 min.
The area
The outline as issued.
The facts
- Issued
- Dec 11, 2008, 8:24 AM EST (13:24 UTC)
- Expired
- Dec 11, 2008, 9:30 AM EST
- In force
- 66 min
- Issued by
- the Storm Prediction Center
All 62 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Brevard County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Flagler County, FL, Hernando County, FL, Hillsborough County, FL, Lake County, FL, Manatee County, FL, Marion County, FL, Nassau County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Union County, FL, Volusia County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Brantley County, GA, Bryan County, GA, Bulloch County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Echols County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glynn County, GA, Irwin County, GA, Jeff Davis County, GA, Jenkins County, GA, Lanier County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Montgomery County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Toombs County, GA, Treutlen County, GA, Ware County, GA, Wayne County, GA, Wheeler County, GA, Jasper County, SC
The radar
The Jacksonville radar (KJAX), 112 km from the middle of the area, began a volume at 13:27 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 1.4 hours before the alert went out and 114 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 286 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 567 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 205 m²/s²
- 0-3 km storm-relative helicity
- 241 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 11, 5:27 AM EST | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 29 more | 33 min |
| Dec 11, 5:48 AM EST | Tornado Watch | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 31 more | 6 hr |
| Dec 11, 11:21 AM EST | Mesoscale Discussion | SPC | Orange, Seminole, Volusia | 54 min |
| Dec 11, 10:01 AM EST | Mesoscale Discussion | SPC | Banks, Burke, Clarke, Columbia, Elbert, Franklin and 16 more | 119 min |
| Dec 11, 10:15 AM EST | Severe Thunderstorm Watch | SPC | Banks, Barrow, Burke, Clarke, Columbia, Elbert and 18 more | 4 hr |
| Dec 11, 11:00 AM EST | Tornado Watch | SPC | Aiken, Allendale, Bamberg, Barnwell, Beaufort, Berkeley and 33 more | 8 hr |
| Dec 11, 1:28 PM EST | Mesoscale Discussion | SPC | Berkeley, Calhoun, Charleston, Chester, Chesterfield, Clarendon and 20 more | 92 min |
Nearby
Mesoscale Discussions in Georgia, 2008Mesoscale Discussions in Florida, 2008Mesoscale Discussions in South Carolina, 2008Every mesoscale discussion in 2008
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.